I don't know if it will work but if you just need them in order maybe something like?
my_function1 && my_function2 && ...
or possibly
`my_function1 && my_function2 && ...`
or
'`my_function1 && my_function2 && ...`'
or
"`my_function1 && my_function2 && ...`"
(depending on how you write the code quotes may need a "\" before them as well)

hopefully one of those works
(if they don't need to be completed in order, just started in order use a single & instead of the double &&)_________________Check out my github repositories. I may eventually get around to updating my blogspot.

hmmm that would be bad since just having a function that would
killall <program_name>
would prevent being able to use any variables that gtkdialog would return

I wonder if it is possible to export the variables first by:
my_function && export var1 var2 ... && killall <my_program>

there is a way to give your program a name so that it doesn't kill other gtkdialog programs but I don't remember off hand ... could just make a symlink for it so that the name is different._________________Check out my github repositories. I may eventually get around to updating my blogspot.

using exit in the function would exit the whole script... but you got me thinking... what if you use?
return EXIT:OK
and put the call to the function as discussed before_________________Check out my github repositories. I may eventually get around to updating my blogspot.

but you don't even need to start a window manager at all - gtkdialog has a builtin method of attaching itself to a display just as a window manager does

Xvesa & gtkdialog3 -f <file> --display=:0 -c && killall Xvesa
#this can also be -p VARIABLE and can be part of a script_________________Check out my github repositories. I may eventually get around to updating my blogspot.

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